Telescopic taper attachment



1939- c. A. BICKEL ET AL ,1 6,700

TELES COP I C TAPER ATTACHMENT Filed May 5, 1936 6 Sheets-Sheet l INVENTORS C1 lFFaezz n. Blot 1 WSW.-

ATTORNEYS Oct. 17, 1939. c BICKEL ET AL 2,176,700

TELESCOPIG TAPER ATTACHMENT Filed May 5, 1936 'e Sh'ets-Sheet s 'T T" INVENTORS D CLIFFORD A. a/ckzz, x0127- H- W/ALS.

ATTORN EYS Oct. 17, 1939'. c. A. BICKEL ET AL TELESCOPIC TAPER ATTACHMENT Filed May 5, 1956 e Sheets-Sheet 4 As E B a 5 a w SQ .TRE N 0 w w? mm M! & n a Q Y ATTORNEY5 7, 1939- C. A. BICKEL ET AL TELESCOPIC TAPER ATTACHMENT Filed May 5, 1936 6 Sheets-Sheet 5 INVENTORS cum-0e mama-1., Y KURT h. WILLS.

KW ATTORNEYS Painted Oct. 17, 1939 UNI ED STATES PATENT OFFICE 2,176,700 TELESCOPIOIAPER ATTACHMENT Clifl'ord A. Bickel and km 11. Wills, Sidney, Ohio,

assignors to The Monarch Machine Tool Company, Sidney, Ohio, a corporation of Ohio Application May-5, 1936, Serial No, 77,982 SClaims. (c e-1'1) taper-turning device having means associated therewith for automatically causing the cutting tool to follow a predetermined path so as to cut a taper with a predetermined angle, this device having means associated therewith for minimizing the friction and wear developed by the movingparts thereof, and eliminating the necessity for frequent adjustment to take up this wear.

Another object is to provide a device for use in i5 connection with turning apparatus, or other ma-r chining apparatus, wherein the tool moves in a path at an angle to a given direction on the workpiece, the motion of the tool being regulated automatically by means associated with theimachine, and adjustable to varying degrees of taper. Another object is to provide such a taper machining device, wherein the tool is directly connected to the taper-guiding means so that the motion of the one is transmitted directly to the other, withsubstantially no lost motion therebetween.

Another object is to provide a'taper-cutting device for use with a turning lathe, wherein the cross slide screw is connected at one end to the cutting tool and at the other end to a member capable of sliding in a guideway arranged at an angle to the aiis of the workpiece, so that the guiding thrust from the member sliding in the gnideway is directly transmitted through the screw to the cuttin tool, this apparatus having anti-friction bearing means, preferably arranged between the relatively sliding members so as to minimize'the friction therebetween, especially when the guideway is arranged at a relatively steep angle to the axis of the work-piece.

Another object is to provide a taper-turning Figure 2 is a fragmentary side elevation, partly in section, taken along the line 2-2 of Figure l, a'ndshowing' the manner of attaching the bed dog of the taper-turning, device to the bed of the lathe.

Figure 3 is an enlarged planview of a portion of the apparatus shown in Figure 1, showing the taper-regulating devices in greater detail. 5

Figure 4 is a still further enlarged plan view, partly in section, of the devices shown in Figure 3.

Figure 5 is a vertical section in the plane 01' the cross slide screw taken substantially along the line 5-5 of Figure 1.

Figure 6 is an elevational view in section where partly broken away, and looking in substantially the direction of the lines 6-6 in Figure 1.

\ Figure 7 is an enlarged view of the apparatus shown at the right-hand end of Figure 5.

Figure 8 is an irregular section taken along the line 8-8 in Figure 4, showing the adjustable and non-adjustable anti-friction bearings used in this invention.

Figure 9 is a section taken along the line 9-9 in Figure 4.

Figure 10 is a section taken along the line illl 0 in Figure 4. Figure 11 is a side elevation of'the eccentric supporting stud for adjustably mounting the anti-friction bearings.

Figure 12 is a bottom plan view of Figure '11.

General construction a In general, the taper-turning device of this invention consists of a guideway or swivel which may be attached to the lathe, or other machine tool, this swivel having a guideway within which moves a member operatively connected to the $5 cutting tool in such a manner that as the member slides down the guideway the tool follows a similar path along the work-piece. Accordingly, when the guideway is arranged at an angle to the axis of rotation of the work-piece the cutting (0 tool will cut a corresponding taper upon the work-piece. In particular, the sliding member is operatively connected at one end to the cross slide screw. the opposite end of which is connected to the cuttingtool, and anti-friction bear- 46 ings of a novel type are employed to minimize the friction which would otherwise exist between the relatively sliding parts. An anchorage block or bed dog is provided for releasably anchoring the device to the bed of the lathe so that the device so may be used or rendered inoperative at the will of the operator.

V Hitherto, in turning tapered work-pieces, it has been necessary for the operator todevote his I constant attention to feeding the tool at the. II

proper speed to remove the proper amount of material in order to produce the proper amount of taper. The taper-turning devices hitherto in use have been suitable only for cutting tapers of relatively small angles. When a work-piece having a steep taper is cut with such devices, the friction existing between the tool-guiding member and the guideway in which it moves has been so great that-such devices have not been practical under; such conditions. The friction' thus developed also gave rise to considerable wear, and this in turn, created inaccuracy in the taper produced. By reason of this wear frequent adjustment was also required, this adjustment necessitating the moving of the guideways or slideways toward one another to take up the excessive clearances. Such devices have also employed independent members for transmitting the thrust from the sliding member to the cutting tool, whereas the present device employs the cross slide .screw itself for transmitting this guiding force. To eliminate this friction the applicants provide the special type of anti-friction bearing disclosed in the present specification and drawings. This feature also reduces the wear, and consequently eliminates the need for frequent adjustment of the device, as is necessary in prior devices of this nature.

Referring to the drawings in detail, Figure 1 shows a lathe having a bed III with longitudinal ways H on the upper portion thereof. Upon these ways travels the lathe carriage, generally designated I 2, this being moved to and fro in the usual manner by a lead screw (not shown) or by the usual hand wheel and rack (not shown). The lathe is provided witha head stock, generally designated I3, which contains the driving .;mechanism for rotating the live spindle I4, and

' through it the work-piece l5.

nection is made in any suitable manner, the means shown being the dog It attached to the work-piece l5, and engaging a slot in the face plate [1. When the face plate I! is rotated by the mechanism within the head stock l3, the rotation of the face plate II will rotate the workpiece H by the connection through the dog It. At its opposite end the work-piece I5 is supported by the bed spindle it supported in the tail-stock l9, and movable to and fro by means of the hand wheel in The tail-stock i3 is slidable along the-bed ofthe lathe in the usual manner, and may be clamped'in any desired position in customary ways. 1

Carriage construction The lathe carriage I2 is provided with an apron 2| which extends downwardly in front of the lathe, and which contains thevarious controls for manually-regulating the motion of the carriage. Mounted on thecarriage I2 is a support 22, in which is journalled a sleeve -23. Operatively connected to the outer endof the sleeve. 23, as by the key 24, is a hand wheel 25 by means of which the sleeve 23 may be rotated manually. Also keyed to the sleeve 23, as by-the key, is a micrometer head 21, by means of which the feeding motion of the hand wheel 25 may be regulated as to the amolmt by which it feeds the cutting tool to the work-piece. The

support 22 is provided with a corresponding hublike-portion 28 adapted to bear a suitable index- The driving con- 4'. I threaded hole ii adapted to receive the threaded tobe accurately' end of 'the cross feed screw 23 having screw threads 30. in its intermediate portion. The outer endof the cross feed screw 29 is provided with a keyway 3i adapted to receive a key 32 secured to the sleeve 23 in such a manner as to form a driving connection therebetween and yet to permit the cross feed screw 29 to be moved telescopically into and out of the sleeve 23. The

. inner end of the sleeve 23 is provided with teeth forming a driving pinion 33 which meshes with a drive gear 3|, mounted upon a jack shaft 35 within the apron 2|. The drive gear 34 is operatively connected by means of conventional gearing to the feed rod of the lathe so that the rotation of the feed rod will cause the rotation of the drive gear 34, with consequent rotation of the sleeve 23 and the cross feedscrew 29.

Reciprocably mounted on the portion 36 of the carriage i2 is the bottom slide 31, to which is secured the cross feed nut 38, as by the bolts 39. Consequently, when the cross feed screw 29 is rotated the nut 38 is caused to move along the threaded portion 30, and carries the bottom slide 31 to and fro in a direction transverse to the longitudinal ways II on the lathe bed. The bottom slide 31 is provided with. the usual compound slide or tool slide ll (omitted for sake of clearness from Figures 3 to 7, inclusive, but

shown in Figure 1). The tool slide II is of conventional construction, and is supported slidably upon the bottom slide 31 in such a manner as to be moved to and fro relatively thereto when the hand crank ll (Figure 1) is rotated by the operator; The tool slide 40 is provided with a slotted portion 42, within which is' mounted the tool post 43 having the cutting tool 44 held thereby. The tool post clamping screw I5, when rotated in one direction, serves to clamp the tool post 43 in the grooved portion 42 and also to firmly secure the tool 44 within the tool post 43. The compound slide 40 is also capable of being swung angularly in the usual manner, it being provided with a turntable portion 48, which cooperates with a similar portion 4'! upon the bottom slide 31.

Taper-regulating mechanism The right-hand end'of the cross feed screw 29 (Figure 5) is provided with a reduced diameter portion 50, which is journalled in bearings 5| (Figure '7) and provided with anti-friction thrust bearings 52 and 53. The bearings ll may be of any suitable type, the type illustrated consisting of bronze bushings. The bearings II are mounted in the carriage shoe 4, which is slidably mounted in'the guide members III (Figure 8), upon which rest the elongated plates The carriage shoe 54 is provided with a 'OI therethrough, so that the space 62 around the reduced diameter portion 53 may be filled with lubricant to lubricate the bearings SI, 52 and 53. The retainingnut 63, threaded onto the threaded end SI of the cross feed screw 23, en-

The guide bracket 55 is secured to the device supporting bracket 1 by the bolts I3.

Ali?

outer end of a bed dog Q 5 and is provided The taper device supporting bracket 6? is secured to the carriage I? by means of cap screws 68 (Figures 3 and 4), and aligned therewith by dowel pins (not shown). The supporting bracket 61 is provided with gibs l0 and H, provided with retaining portions 12 and I3, Mounted in recesses in the gibs Hi and ii are anti-friction bearing. assemblies M of a special type, hereinafter described in detail. The upper surface of the supporting bracket tl is also provided with anti-friction bearing assemblies 15.

The slide it rests upon the anti-friction bearing assemblies i5, and slides between the antifriction bearing assemblies i t-mounted in recesses in the ways it and ii. The bearings 15 thus support the weight of the slide it, whereas the bearings M resist the thrust upon the slide while the device is in operation. On the ends 01 the slide it are mounted the swivel clamps ill and it (Figure 3), being secured thereby to the bolts 79. The swivel clamps H and it (Figure 6) are provided with overhanging arcuate edges, beneath which are arranged the opposite ends of the swivel 80-. The swivel clamp 58 is additionally provided with an arcuate rack ti meshing with a pinion 82 mounted upon a shaft 83, supported in the bracket M upon one end of the swivel (wand having a hand wheel 95 for rotating the pinion 82. An index pointer 36 cooperates with scales 8! and t8 upon the swivel clamp '38 so as to indicate the amount by which the swivel til is displaced from its position parallel with the ways it of the lathe bed. The swivel 80 may be locked in any position of adjustment by tightening the bolts 59, thereby clamping the flanged edges of the swivel-clamps H and i8 tightly down upon the ends of the swivel 8t.

Secured to one end of the slide it is an anchor rod bracket 89 (Figure 3), as by the set screws 9%. Threaded into a' boss on this bracket 89 isone end of an anchor rod 9!, the opposite end of which is threaded, as at it. The threaded end $2 passes through a slot 93 in the with nuts 95 and 96 on opposite sides thereof. The bed dog 96 is clamped to the edge rib 9'8 (Figure 2) by means of the clamping bolts 93 and the clamping member 99 cooperating therewith By loosening the bolts 88 the bed dog 9 may be slid along the edge rib 9i and clamped at any desired position. The slide it (Figure 7) is provided centrally with a swivel stud me, upon which is threaded the retaining nut lti. The swivel stud Hill is provided with ahead are which serves to provide a pivotal support for the opposite sides of the swivel 8d. Engaging these opposite sides are anti-friction bearing assemblies N3, of a type similar to the bearings lid and i5 and mounted upon the carriage shoe slide 884 (Figures 4 and 7), the center of which is provided with a bore W5 which serves to pivotally receive the stem portion Hit of the carriage shoe 56. A dust cover ld'l is held in position by the washer 59, which inturn, is engaged by the nut Hit of the threaded stud 5t.

The carriage shoe 5% is likewise provided with anti-friction bearings 809 (Figure 9) engaging the guide members HQ. The latter are secured at their opposite ends to the taper device supporting bracket bl and guide bracket 55 by the screws ill anddowel pins H2, and by the screws H3 and dowel pins lit, respectively, (Figures 3 and 4).

Arranged between the stem portion Hit and respectively.

Figure. 4.

opposite ends of the supporting bracket tall are.

the bore I05 is a bearing bushing 9 l5. Beneath this is a disc lit secured to the stem Hit by the screws ill, and having a projecting portion entering the locating hole H8. The oil passages llt serve to distribute lubricant to the bearing bushing M5 from the space 82. The guide members M0 and the swivel 83 are constructed from hardened steel, and the slide it mounted, according to the location of thebearing assembly. In the bearing assemblies it! the inner race 52b is mounted upon stud bolts 8263 or E25. In the stud bolt lid the portion upon which the inner race lid of the single bearing is mounted is coaxial with the bearing race. The stud bolts E25, however, as shown inFigure 11, are provided with eccentric portions 1126, upon which the inner race iZd is mounted. Consequently, the position of the bearing may be adjusted by loosening the nuts l2? and Mt (Figure 6), by which each stud bolt is held in position, whereupon the bolt may be turned until the bearing is shifted by a sufiicient amount to bring it into engagement with the part which it supports. side of the slide it is mounted upon the plain or coaxial stud bolt 92 3, whereas the remainder of the bearing assemblies M are mounted upo'n eccentric stud bolts H25, as shown in Figure 4.

By this means the bearing assemblies M can be accurately adjusted against the sides of the slide it, the bearing assembly M upon the plain stud bolt 92d serving as a point of reference.

The bearing assemblies l5, supporting the weight and vertical thrust of the slide it, are mounted in two difierent manners, as shown in The bearing assemblies 15 at the mounted upon pins i255 secured in bearing brackets ltd, attached by the cap screws till to the supporting bracket 6? (Figure 4). The bearing assemblies l5, arranged in the supporting bracket til between the opposite ends thereof (Figures 4 and 10), are mounted upon pins Edda, the

opposite ends of whic hare secured in trans verse bores idle in sleeves @332, having flanges E33 by which the sleeves are held within the bores @359, as by the screws lib.

Two of the bearing assemblies 6&3 (Figure 8) are mounted within slots H36 in the corners of the carriage shoe slide 50 3, and are supported upon One bearing assembly lid on the inner pins it? in vertical bores lit. The other two bearing assemblies Hi3 are mounted upon the eccentric portions N39 of stud bolts ,i id, held in position by the nuts Ml and locknuts M2. By loosening the nuts. Ni and M2 the eccentric stud bolts M0 may be rotated to adjust the clearance between the bearing assemblies me and the inner sides of the swivel ill].

The bearing assemblies EM? are similarly supported in slots M3! in the corners of the carriage shoe 5d (Figures 4 and 9). Two of these bearing assemblies l 09 are mounted upon pins Mt, whereas the other two are mounted upon the eccentric portions 35 of the stud bolts M5 having the nuts w I41 and locknuts I48. By loosening the nuts I41 and I40, the stud bolts I46 may be rotated so that the clearance between the bearing assemblies I and the *guide members I I0 may be accurately adjusted.

Operation The taper device of this invention may be connected or disconnected at will so that the lathe may be employed for turning straight work or for tapered work .without removing the device.

In turning straight work the bolts 90 are loosened so that the bed dog 94 is capable of sliding along the rib 91. The nut III! of the threaded stud 56 is tightened so as to lock the carriage shoe 54 to the guide members H0. This same action also holds the cross feed screw 29 stationary and takes the strain on. the slides.

Consequently, when the machine is started and the tool 44 is caused to move along the work-piece and cut a straight portion thereon, the entire taper device with its bed dog 9'4 moves along with the carriage I2, and oflers no resistance to the turning operation being performed.

In turning tapered work, however, the swivel 80 is set at the desired angle of taper by turning the hand wheel 85 and setting the index pointer 06 opposite the proper graduations upon either of the scales 8? or 88. The swivel is then clamped in position by tightening the clamping bolts I9, thereby bringing the end clamps TI and I0 tightly into engagement with the swivel 00. The bolts 00 of-the bed dog 94 are also tightened, thereby anchoring the entire assembly to the bed of the machine. The clamping nut I08 upon the threaded stud 56 is loosened so as to free the carriage shoe 54 from its engagement with the guide members I I0, and allowing the cross feed assembly to travel inwardly or outwardly according to the angle at which the swivel 80 is set. The cutting tool 46 may be set to'any desired position by turning the hand wheel 25 (Figure due to the telescoping arrangement of the cross feed screw; shaft .29 within the sleeve 23, and-without shown in Figures 1 and 3, assuming that the car any interference of the one with the other.

As the carriage feeding mechanism is started the carriage shoe slide I04 moves along the space between the opposite sides of the swivel 00, which remains stationary by reason of its being anchored to the lathe bed through the anchor rod SI and bed dog 94. In the arrangement riage moves to the right, the carriage shoe slide I04 will move toward the back edge of the machine, thereby pulling the carriage shoe 04 and- Through the connection of tance to free it from engagement with the bed dog 94. The nut 90, however, is set at a position corresponding tov the location where it is desired to have the beginning of the taper. Consequently, during the initial part of the motion of the carriase the slide 16 moves as a unit with 'the carriage I2, the anchor rod 92 sliding loosely through the slot 93 in the and of the bed dog 94 until the nut 0'6 is reached. When this occurs the motion of the slide "is immediately halted and the taper devices begin their operations. The carriage shoe slide I04 then begins to pursue an oblique path between the opposite sides of the swivel 80, in the manner previously described, and the tool 44 begins to cut a tapered portion upon the workpiece IS.

It will be understood that we desire to comprehend within our invention such modifications as come within the scope of the claims and the invention.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is: V

1. In a machine tool, a cutting tool, means for rotating a work-piece, means for moving said cutting tool relatively to said work-piece, a guiding member, a following member engaging said guiding member, an element pivotally engaging said following member, a cross feed screw adapted to operatively interconnect said pivotal element and said cutting tool, anti-friction bearing devices arranged betweensaid guiding member and said following member, each anti-friction bearing device having multiple rotary bearing elements, and means for driving said cross feed screw arranged to permit axial motion of said screw.

2. Ina machine tool, means for rotating a work-piece, a longitudinally movable carriage, a cross slide thereon, a, cross feed screw arranged to move said cross slide, a. cutting tool associated with said cross slide, means for rotating said cross feed screw, a guiding member having a movable guideway adapted to be adjusted to positions disposed at angles to the axis of rotation of said work-piece, a following member adapted to engage said guideway, means interconnecting said following member and said cross feed screw, and devices for releasably locking said cross feed screw against rotation.

- 3. In a machine tool, means for rotating a work-piece, a longitudinally movable carriage, a cross slide thereon, a cross feed screw arranged to move said cross slide, a, cutting tool associated with said cross slide, means for rotating said cross feed screw, a guiding member having a movable guideway adapted to be adjusted to positions disposed at angles to the axis of rotation of said work-piece, a following member adapted to engage said guideway, means interconnecting said following member and said cross feed screw, and

devices for releasably locking said cross feed screw against rotation, said cross feed screw rotating means being adapted to telescopically receive said cross feed screw to permit axial motion thereof.

CIJFFORD A. BICKEL. KURT H. WILIS. 

